How to get rid of black bars in sony vegas?

Will

New member
I have used sony vegas for a long time and this has never happended. So whenever I render a video it has thin black bars on the left and right. It doesnt even show them in the preview screen.
I have the same capture card and nothing has changed since the last time I rendered a video so I dont know why its doing this. Any help will be appreciated.
 
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